最优法Hilbert滤波器与小波变换融合的功率测量算法

Power measurement algorithm based on optimal Hilbert filter and wavelet transform fusion

为了提高非正弦条件下无功功率测量的精度,提出采用最优法Hilbert滤波器与正交小波变换融合的功率测量算法,利用最优法设计的Hilbert数字滤波器对各次谐波电压分别相移90°,通过正交小波变换将各次谐波电流与相移90°后的谐波电压进行分解,获得了有功及无功功率。结果表明,该算法的无功功率测量误差小于0.18%,有功功率测量误差小于0.03%,算法具有推广意义。

This paper seeks to improve the accuracy of reactive power measurement under non-sinusoidal conditions and proposes a power measurement algorithm using the optimal method of Hilbert digital filter and orthogonal wavelet transform fusion.The study involves phase shifting the voltages respectively by 90°,using orthogonal wavelet transform to decompose each harmonic current from the harmonic voltage phase shifted by 90°,and calculating the active and reactive powers.The simulation results show that the algorithm with reactive power measurement error of less than 0.18%and the active power measurement error of less than 0.03%promises a wider application.